Hearthpwn

Kolento's secret warlock deck, he was playing this deck at Legend Rank 2 after he reached his subscriber goal, i'm not too sure of it's Winrate % though.

watch his stream here:

http://www.twitch.tv/kolento

UPDATE 18/05/2014

After watching his stream for a bit, Kolento says that this deck is about one ultimate flexible win condition, which is a charge minion + power overwhelming (x2) + faceless manipulator to burst the opponent down and win in one turn.

The various substitutes for the 'Charge minion' include: Bluegill Warrior, Wolfrider, Arcane Golem and Leeroy Jenkins

e. g. 

Bluegill Warrior + Power Overwhelming x2 + Faceless Manipulator = 20 damage, 9 mana

Wolfrider + Power Overwhelming x2 + Faceless Manipulator = 22 damage, 10 mana

Arcane Golem + Power Overwhelming x2 + Faceless Manipulator = 24 damage, 10 mana

Leeroy Jenkins + Power Overwhelming + Faceless Manipulator = 20 damage, 10 mana

The overall burst can be increased by an additional +8 damage by using two Soulfire but, due to the random nature of the card, it can be used for +4 damage if the other Soulfire is discarded. Furthermore, the soulfires don't necessarily need to be used for burst purposes but as removal, due to the 'Midrange' cards within the deck the enemy's hero can reach the sweet spot of ~20 health rendering the soulfires useless however, you run the risk of discarding the combo cards.

Since, there are essentially 4 types of win conditions with the different charge minions, all of them costing 10 mana to execute, excluding the combo with with Bluegill Warrior, which costs 9 mana, if you have multiple charge minions in your hand for example, Wolfrider and Arcane Golem it would be within your best interest to use the Wolfrider as removal as the Arcane Golem has +1 damage and the mana cost is the same, the same thing applies with Leeroy Jenkins only if you have one Power Overwhelming in your hand as the burst will be higher with if you have two Power Overwhelming + Arcane Golem + Faceless Manipulator by +4 damage.

The idea behind having multiple spells, is for removal purposes in order to survive to ~turn 10 and kill them in one turn. The Earthen Ring Farseer and Drain Life are for self healing in case of being one turn killed by Aggro decks/other combo decks. 

A general tip when using this deck is to always check how much damage you have in your hand regardless of missing cards of the one turn kill combo as you may have enough damage. E. G.  without Faceless Manipulator your Leeroy Jenkins + Power Overwhelming (x2) will do 14 damage and a further +4/+8 damage depending on the Soulfire (s) meaning you can deal 14-22 damage at turn 6.

On a side note, Kolento did not reach Legend Rank 1 but, he did consistently win matches at Legend Rank 2 for a significant amount of time.